Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb7d3f6cd53f2e5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 10:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e16ce5e0e21d669ad541456fe6b0244c SHA-1: fe801c5f5a81594d0c5a5a97fd5a3e68a18ba723 SHA-256: 9fb7d3f6cd53f2e54a768ede340e17b84ac101372d7627252afcc882881d3c73
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c813db22b---junenanit.pdf In PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/79710624818.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/68343853773.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/famali.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/87562595509.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea6d6021f---petawupifaxusedezuw.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sezezot.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/47844173228.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/63104777525.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/47330031374.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/napetedetobapujabuxorivo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367418e07bf---15904691844.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/69124195361.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/kebatumuzexuxonojujimefa.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-1/20210901221842714253.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/29893486110.pdfIn PDF document text
    • https://ms2oke.com/contents/files/guvivuri.pdfIn PDF document text
    • https://grandegroup.net/files/1631930120.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109011617025763.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/13146572365.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc93af580---susalelid.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lipisifonumigofa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613094134f3b3---rorivinopo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fbda675a9---jomutosafud.pdfIn PDF document text
    • http://naso10.com/userData/board/file/41223363718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=battle+night+cyber+punkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC386 19212 bytes
SHA-256: 49b7065ee627957eba3c6ed5b708db317f376e2b2646e77f74a11765fb3dc67e
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 10864 bytes
SHA-256: 01520ad6e4d61a1fe7dd40b2b310de51567fc15a5bec9e3d7ad2e63b2af12b23
font_02_sfnt_off00010d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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